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Lobohalacarus Weberi (Acari, Halacaridae) from Shallow Ground Waters in South Korea

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Lobohalacarus Weberi (Acari, Halacaridae) from Shallow Ground Waters in South Korea Anim. Syst. Evol. Divers. Vol. 37, No. 3: 242-248, July 2021 https://doi.org/10.5635/ASED.2021.37.3.016 Short communication Lobohalacarus weberi (Acari, Halacaridae) from Shallow Ground Waters in South Korea Jong Hak Shin1, Jimin Lee2, Cheon Young Chang1,* 1Department of Biological Science, Daegu University, Gyeongsan 38453, Korea 2Marine Ecosystem Research Center, Korea Institute of Ocean Science & Technology, Busan 49111, Korea ABSTRACT Lobohalacarus weberi (Romijn and Viets, 1924) is added to the halacarid fauna of Korea as the third member of freshwater halacarid species. Both the genus and species are newly recorded from Korea. Halacarid mites were collected from two hillside wells and a streamside hyporheic zone in the southeastern region of South Korea. Lobohalacarus weberi is characterized by a well­developed frontal spine­like process, seven dorsal setae, the fourth segment of palp with a short distal and three long proximal setae, and tibiae of legs II to IV with two, one, two pectinate setae, respectively. A few minor individual variabilities were observed in the number of perigenital seta and genital acetabula, the setal armature on genua of legs, and the shape of spinule row on lateral claws. Keywords: ‌description, freshwater, halacarid mite, hyporheic zone, new record, wells INTRODUCTION Voucher specimens are kept in the specimen room of the Department of Biological Science, Daegu University (DB), As shown in the taxon name of “Halacarida” (meaning ‘aca­ Gyeongsan, Korea. rids from salt waters’), halacarids are basically marine. Terminology and abbreviations in the text and figure cap­ Only 67 species or subspecies of 17 genera (about 6% of tions follow Bartsch (2006): AD, anterior dorsal plate; AE, the total number of species currently recorded in the family anterior epimeral plate; ds, dorsal setae on idiosoma (ds­ Halacaridae Murray, 1877) are freshwater or brackish­water 2, second dorsal setae on idiosoma); GA, genitoanal plate; (Bartsch, 2018; FADA, 2021). Recently, we have collected gac, genital acetabula; glp, gland pore(s), numbered glp­1 to four halacarid mites at two hillside wells and a streamside hy­ glp­5 from anterior to posterior; GO, genital opening; OC, porheic zone in the southeastern region of South Korea (Fig. ocular plate(s); P, palp (P­2, second palpal segment); pas, 1). They are identified as the Lobohalacarus weberi (Romijn parambulacral setae; PD, posterior dorsal plate; PE, poste­ and Viets, 1924), notwithstanding a few minor morphological rior epimeral plate; pgs, perigenital setae; sgs, subgenital variations were observed among the specimens examined. setae. Herein we redescribe it as a new record from South Korea. Following the two former records, Soldanellonyx chappui- SYSTEMATIC ACOOUNTS si Walter, 1917 by Imamura (1968) and S. monardi Walter, 1919 by Shin and Chang (2021), this is the third report on the Subclass Acari Leach, 1817 freshwater halacarid mites from Korea. Order Trombidiformes Reuter, 1909 Methods for field and laboratory works, such as collec­ Suborder Prostigmata Kramer, 1877 tion, preparation for microscope examination, drawings and Superfamily Halacaroidea Murray, 1877 measurements, are the same as in our previous studies (Lee Family Halacaridae Murray, 1877 and Chang, 2017; Shin and Chang, 2019, 2021). 1*Genus Lobohalacarus Viets, 1939 Korean name: 1*거북등짠물응애속 (신칭) This is an Open Access article distributed under the terms of the Creative *To whom correspondence should be addressed Commons Attribution Non­Commercial License (http://creativecommons.org/ Tel: 82-53-850-6454, Fax: 82-53-850-6459 licenses/by­nc/3.0/) which permits unrestricted non­commercial use, distribution, E-mail: [email protected] and reproduction in any medium, provided the original work is properly cited. eISSN 2234-8190 Copyright The Korean Society of Systematic Zoology Lobohalacarus weberi (Halacaridae), New Record from Korea Fig. 1. Localities. A, A map showing three collection sites in South Korea: 1, Gyeongsan; 2, Pohang; 3, Ulsan; B, A well in Gyeong- san; C, A well in Pohang; D, Jujeon valley, Ulsan. 1*Lobohalacarus weberi (Romijn and Viets, 1924) ae irregularly. AD 94 μm long, 68 μm wide (length to width (Figs. 2, 3) ratio about 1.38); anterior part blunt triangular­shaped, pos­ Walterella weberi Romijn and Viets, 1924: 217, figs. -3 6; terior margin nearly straight or slightly concave, and the Walter and Bader, 1952: 224, fig. 58. widest at level of 3/4 of AD. OC elongated and narrowing Lobohalacarus weberi: Viets, 1939: 506; Green and Mac­ posteriorly, 62 μm long, 23 μm wide (length to width ratio Quitty, 1987: 162, fig. 68A-D; Bartsch, 2006: 128, fig. about 2.70); corneae and glp absent. PD large, 1.91 times 5­8a-f; 2011: 493, fig. 3A-C; 2018: 85, fig. 4A-E. longer than wide, 157 μm long, 82 μm wide; anterior margin Walterella weberi quadripora Walter, 1947: 236, fig. 35 (cit­ wider than posterior one and both margin nearly straight or ed from Bartsch, 2018). slightly arched. Seven pairs of dorsal setae (ds) short: ds­1 Lobohalacarus weberi quadriporus: Bartsch, 1975: 35, figs. located between frontal process and anterior AD; ds­2 situ­ 38-53. ated near anterior margin of 1/3 AD; ds­3 and ds­4 located on OC, ds­3 at anterolateral corner of OC and ds­4 at half of Material examined. Korea: 1♀ (DB50040), Gyeongsang­ OC; remaining 3 dorsal setae (ds­5-7) evenly spaced 1/3 of buk­do: Gyeongsan­si, Sajeong­dong, a well (near Gyeong­ PD, from anterior third PD to posterior margin of PD. san railway station), 33°43ʹ16ʺN, 128°43ʹ39ʺ, 31 Mar 2020, All ventral plates (AE, PE, and GA) fused (Fig. 2B) and Chang CY; 1♀ (DB50041), Pohang­si, Donghae­myeon, ornamented with numerous foveae. The region correspond­ Heunghwan­ri, a well (in a seaside village), 36°01ʹ43ʺN, ing AE with 3 pairs of ventral setae, and pair of epimeral 129°30ʹ14ʺE, 23 Jul 2020, Chang CY and Shin JH; 1♀ pores present near trochanter of leg II. PE region with 1 (DB50042), same locality as previous, 9 Oct 2020, Shin JH; short dorsal, 1 long lateral and 1 ventral seta. GO (Fig. 2B, 1♀ (DB50043), Ulsan­si, Jujeon­dong, Jujeon stream (near E) 52 μm long, 31 μm wide (length to width ratio about Jujeon­campsite), 35°33ʹ08ʺN, 129°27ʹ06ʺE, 18 Apr 2021, 1.68); posterior portion protrudes slightly backward, with Shin JH. All the specimens mounted on H­S slides. 3 gac on each outside of genital sclerites, lacking sgs. Four Description. Female (DB50043): Idiosoma (Fig. 2A) 271 pairs of pgs (Fig. 2B) present around GO; foremost pgs lo­ μm long, 151 μm wide, with single sharp frontal process, 22 cated far from ahead of GO; succeeding 3 pgs situated at μm long, protruding forward on anterior edge of body. AD, near anterolateral margin, middle, and posterolateral margin PD and OC separated and ornamented with numerous fove­ of GO, respectively. Korean name: 1*거북등짠물응애 (신칭) Anim. Syst. Evol. Divers. 37(3), 242-248 243 Jong Hak Shin, Jimin Lee, Cheon Young Chang Gnathosoma (Fig. 2C) 84 μm long, 49 μm wide (length to of gac on posterior genital sclerites was also variable: two width ratio about 1.71). Rostrum 42 μm long, similar length pairs of gac in two specimens, three pairs in one specimen, to gnathosomal base; tip of rostrum extending to anterior while two and three gac in each side in a specimen from Po­ edge of P­2, in ventral view. Gnathosoma with 4 pairs of hang (DB50042). Genu I showed armature of a stout fang­ rostral setae: proto­ and deutorostral setae situated along like and a sharp spiniform setae ventrally in three females, distal and sub­distal edge, respectively; tritorostral setae while two stout fang­like setae ventrally in the female from long, naked and located at level of posterior 70% rostrum Pohang (DB50041) (Fig. 3H). The female from Gyeongsan ventrally; basirostral setae the longest, 1.45 times longer (DB50040) has a comb row of 10-15 teeth along the inner than tritorostrals one, naked, and situated at base of rostrum. surface of lateral claws, while the three specimens from the Palp consisting of 4 segments; lengths of P­1 to P­4 10, 33, other two localities showed a row of 4-7 setules near the 11, 30 μm long, respectively; P-1 the shortest, without setae; middle of ventral edges of lateral claws. One female speci­ P­2 the longest, about 3 times longer than P­1 or P­3, with men from Pohang (DB50041) showed only three pectinate 1 long dorsal seta anteriorly; P­3 subequal to length of P­1, setae without a ventral spiniform seta on the tibia of the left armed with 1 short spiniform seta on its inner­distal corner, leg II (Fig. 3I). 5 μm long; P-4 with 3 long setae subproximally, 1 short seta Distribution. Europe (Romijn and Viets, 1924; Green and inner­distally, and bifurcated distal end. Chelicera (Fig. 2D) MacQuitty, 1987; Bartsch, 2008), Africa (Walter and Bader, 83 μm long; movable digit formed a spine 14 μm long, with 1952; Bartsch, 2008, 2013, 2018), Iran (Pesic et al., 2006), several minute denticles on inner surface. Vietnam (Bartsch, 2014), Russia (Stolbov et al., 2018), Can­ Chaetotaxy of legs (tarsi excluded) (Fig. 3A-D): trochan­ ada (Bartsch, 2011), Hawaiian Islands (Imamura, 1981), ters 1­1­1­0; basifemora 3­3­2­2; telofemora 5­4­3­2; genua U.S.A. (Bartsch, 2011), Korea. 6-6-3-3; tibiae 8-7-5-6. Genu I with 4 filiform setae dorsally, Remarks. In the genus Lobohalacarus Viets, 1939, eight 1 stout fang­like and 1 sharp spiniform setae ventrally. Tibia species or subspecies are currently recorded (FADA, 2021). I with 4 filiform setae dorsally, 2 sharp spiniform and 2 stout Among them, L.
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